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GNS3 Lab & Exercise: VPN troubleshooting Lab Scenario

Written by irom from http:// on November 9th, 2011 | 24 Comments

Scenario: A simple IPsec tunnel between fast Ethernet interfaces of routers SW1 (f1/1) and R1(f0/0). But it doesn’t work..

SW1#ping 10.0.0.2 source 10.0.10.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.0.0.2, timeout is 2 seconds:
Packet sent with a source address of 10.0.10.1
…..
Success rate is 0 percent (0/5)

R1#ping 10.0.10.1 source 10.0.0.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.0.10.1, timeout is 2 seconds:
Packet sent with a source address of 10.0.0.2
…..
Success rate is 0 percent (0/5)

Find out why without looking into initial configuration files, all IOS commands are allowed.

Routers Used: Cisco C3745
IOS: (C3745-ADVENTERPRISEK9-M), Version 12.4(23)
Feature of Topology: VPN, IPSEC, ISAKMP,RIP
Download GNS3 files: http://www.uploadhookup.com/index.php/files/get/YA4jjABr6Z/vpn-troubleshooting.rar

Solution:

Looking into initial configuration file will help !

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24 Responses to “GNS3 Lab & Exercise: VPN troubleshooting Lab Scenario”

  1. avatar Thomas McLean

    Thanks for that – a nice easy one but it lets you do some creative debugging and your mind opens up once again if you’ve not done it for a while!

  2. avatar ciscoaspirants

    thanks a lot for the lab… its really helpful !!

    how to configure vrf

  3. avatar Thomas To

    Done. Realy nice lab. Thanks irom!

  4. avatar ratan

    how can i eastablished a vpn tunnel between this ….i have try so many commend but tunnel are not established

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  6. avatar Kista reddy

    Hi All,
    I have followed the script which was added in rar file . Its working for me.
    R1#ping 10.0.10.1 source 10.0.0.2

    Type escape sequence to abort.
    Sending 5, 100-byte ICMP Echos to 10.0.10.1, timeout is 2 seconds:
    Packet sent with a source address of 10.0.0.2
    !!!!!
    Success rate is 100 percent (5/5), round-trip min/avg/max = 4/4/4 ms
    ==========
    R1#ping 10.0.10.1 source 10.0.0.2

    Type escape sequence to abort.
    Sending 5, 100-byte ICMP Echos to 10.0.10.1, timeout is 2 seconds:
    Packet sent with a source address of 10.0.0.2
    !!!!!
    Success rate is 100 percent (5/5), round-trip min/avg/max = 4/4/4 ms
     
    IOS:
    SW1#sh ver
    Cisco IOS Software, 3700 Software (C3745-ADVIPSERVICESK9-M), Version 12.4(25d), RELEASE SOFTWARE (fc1)
    Technical Support: http://www.cisco.com/techsupport
     
     
    Please let me know what was the problem?
     
    Thanks and regards,
    Kista

  7. avatar Kista reddy

    I have found problem and corrected thank you for posting ..

  8. avatar imran

    please help me i want to create vpn ..in cisco 887 a series router ..please send configuration or any examples  my mail id is emran .replay@gmail.com

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  13. avatar jigit

    Hi All,
    I have followed the script which was added in rar file . Its working for me.
    R1#ping 10.0.10.1 source 10.0.0.2
    Type escape sequence to abort.
    Sending 5, 100-byte ICMP Echos to 10.0.10.1, timeout is 2 seconds:
    Packet sent with a source address of 10.0.0.2
    !!!!!
    Success rate is 100 percent (5/5), round-trip min/avg/max = 4/4/4 ms
    ==========
    R1#ping 10.0.10.1 source 10.0.0.2
    Type escape sequence to abort.
    Sending 5, 100-byte ICMP Echos to 10.0.10.1, timeout is 2 seconds:
    Packet sent with a source address of 10.0.0.2
    !!!!!
    Success rate is 100 percent (5/5), round-trip min/avg/max = 4/4/4 ms

    Please let me know what was the problem?   !!!!!!!!

  14. avatar G

    If you open the project in GNS3 you'll get a Phase 1 issue and the pings wont work. Cutting and pasting might change this behaviour.

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